#include <iostream> using namespace std; #define int long long int solve(int n, int ans = 0){ while (n % 9){ int A = n, B; while (A > 9){ B = A, A = 0; while (B) A += B % 10, B /= 10; } ans += A, n--; } return ans + n * 5; } signed main(){ int t, l, r; cin>>t; while (t--){ cin>>l>>r; cout<<solve(r) - solve(l - 1)<<'\n'; } }